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Stockholders' Equity (Details 2) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 1,205,682 | $ 1,033,143 | $ 1,579,921 | $ 353,120
Cost of revenue [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 529 | $ 333 | 1,870 | 3,279 | 4,302 | 117,147
Sales and marketing expense [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 981 | 1,039 | 3,202 | 908 | 1,784 |
Product development expense [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 14,380 | 3,396 | 33,640 | 36,628 | 166,783 |
General and administrative expense [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 211,818 | 148,714 | 610,848 | 436,206 | 665,556 | 50,599
Total stock compensation expense [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 227,708 | $ 153,482 | $ 649,560 | $ 477,021 | $ 838,425 | $ 167,746

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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